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That part is no good for this retrofit. It's for front and rear PDC on a lot of E series chassis’ but has a smaller ROM on the microprocessor and lacks the 'Park Master' settings to active the reverse camera. You need a 9252636 ideally as it came with the latest firmware, but you can also use a 9225822, 9224465 or 9216138 as they can be software upgraded to become a 9252636 if they have not been updated already. These parts were only available on the E84 X1.
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